Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

corona ring

A corona ring, also called an anti-corona ring, is a toroid of conductive material, usually metal, which is attached to a terminal of high voltage equipment. The role of the corona ring is to distribute the electric field gradient and lower its maximum values below the corona threshold, preventing corona discharge.
Corona rings are used on very high voltage power transmission
insulators and switchgear, and on scientific research apparatus that
generates high voltages.